C# 常用方法

1、DataTable转List

public static IList<T> ConvertToModel(DataTable dt)   
         {   
            // 定义集合   
             IList<T> ts = new List<T>();
        
            // 获得此模型的类型  
             Type type = typeof(T);     
            string tempName = "";     
         
            foreach (DataRow dr in dt.Rows)     
             {   
                 T t = new T();    
                // 获得此模型的公共属性     
                 PropertyInfo[] propertys = t.GetType().GetProperties();
                foreach (PropertyInfo pi in propertys)     
                 {     
                     tempName = pi.Name;  // 检查DataTable是否包含此列   
      
                    if (dt.Columns.Contains(tempName))     
                     {     
                        // 判断此属性是否有Setter     
                        if (!pi.CanWrite) continue;        
      
                        object value = dr[tempName];     
                        if (value != DBNull.Value)     
                             pi.SetValue(t, value, null); 
                     }    
                 }     
                 ts.Add(t);     
             }    
            return ts;    
         }  

　　

2、将List转成DataTable
public static DataTable ToDataTable<T>(IEnumerable<T> collection)
 {
     var props = typeof(T).GetProperties();
     var dt = new DataTable();
     dt.Columns.AddRange(props.Select(p => new DataColumn(p.Name, p.PropertyType)).ToArray());
     if (collection.Count() > 0)
     {
         for (int i = 0; i < collection.Count(); i++)
         {
             ArrayList tempList = new ArrayList();
             foreach (PropertyInfo pi in props)
             {
                 object obj = pi.GetValue(collection.ElementAt(i), null);
                 tempList.Add(obj);
             }
             object[] array = tempList.ToArray();
             dt.LoadDataRow(array, true);
         }
     }
     return dt;
 }